diff --git a/src/core/Chef.mjs b/src/core/Chef.mjs
index ab8f83de..5be10868 100755
--- a/src/core/Chef.mjs
+++ b/src/core/Chef.mjs
@@ -55,8 +55,15 @@ class Chef {
             progress = await recipe.execute(this.dish, progress);
         } catch (err) {
             log.error(err);
+
+            let displayStr;
+            if ("displayStr" in err) {
+                displayStr = err.displayStr;
+            } else {
+                displayStr = err.toString();
+            }
             error = {
-                displayStr: err.displayStr,
+                displayStr: displayStr,
             };
             progress = err.progress;
         }
diff --git a/src/core/Ingredient.mjs b/src/core/Ingredient.mjs
old mode 100755
new mode 100644
index 319dfb15..0dd31707
--- a/src/core/Ingredient.mjs
+++ b/src/core/Ingredient.mjs
@@ -5,7 +5,8 @@
  */
 
 import Utils from "./Utils.mjs";
-import {fromHex} from "./lib/Hex.mjs";
+import { fromHex } from "./lib/Hex.mjs";
+import OperationError from "./errors/OperationError.mjs";
 
 /**
  * The arguments to operations.
@@ -119,7 +120,9 @@ class Ingredient {
                 number = parseFloat(data);
                 if (isNaN(number)) {
                     const sample = Utils.truncate(data.toString(), 10);
-                    throw "Invalid ingredient value. Not a number: " + sample;
+                    throw new OperationError(
+                        "Invalid ingredient value. Not a number: " + sample,
+                    );
                 }
                 return number;
             default:
diff --git a/src/core/Operation.mjs b/src/core/Operation.mjs
index 24739d3f..09058766 100755
--- a/src/core/Operation.mjs
+++ b/src/core/Operation.mjs
@@ -5,6 +5,7 @@
  */
 
 import Dish from "./Dish.mjs";
+import OperationError from "./errors/OperationError.mjs";
 import Ingredient from "./Ingredient.mjs";
 
 /**
@@ -223,7 +224,11 @@ class Operation {
      */
     set ingValues(ingValues) {
         ingValues.forEach((val, i) => {
-            this._ingList[i].value = val;
+            try {
+                this._ingList[i].value = val;
+            } catch (err) {
+                throw new OperationError(`Failed to set value of ingredient '${this._ingList[i].name}': ${err}`);
+            }
         });
     }
 
diff --git a/src/core/Recipe.mjs b/src/core/Recipe.mjs
index 7824d1e8..b4a10e03 100755
--- a/src/core/Recipe.mjs
+++ b/src/core/Recipe.mjs
@@ -70,11 +70,15 @@ class Recipe  {
             if (o instanceof Operation) {
                 return o;
             } else {
-                const op = new modules[o.module][o.name]();
-                op.ingValues = o.ingValues;
-                op.breakpoint = o.breakpoint;
-                op.disabled = o.disabled;
-                return op;
+                try {
+                    const op = new modules[o.module][o.name]();
+                    op.ingValues = o.ingValues;
+                    op.breakpoint = o.breakpoint;
+                    op.disabled = o.disabled;
+                    return op;
+                } catch (err) {
+                    throw new Error(`Failed to hydrate operation '${o.name}': ${err}`);
+                }
             }
         });
     }